[英]BeautifulSoup example given in Python documents not working
我正在尝试在BeautifulSoup文档中给出的示例,其中一个示例没有给出预期的结果
html_doc = """
<html><head><title>The Dormouse's story</title></head>
<p class="title"><b>The Dormouse's story</b></p>
<p class="story">Once upon a time there were three little sisters; and their names were
<a href="http://example.com/elsie" class="sister" id="link1">Elsie</a>,
<a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> and
<a href="http://example.com/tillie" class="sister" id="link3">Tillie</a>;
<p class="story">...</p>
"""
from bs4 import BeautifulSoup
soup = BeautifulSoup(html_doc)
在它的例子中说
soup.find_all('b')
# [<b>The Dormouse's story</b>]
但是当我尝试相同的命令时,我会收到如下错误
>>> soup.find_all('b')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'NoneType' object is not callable
但汤对象不是没有
>>> soup
<html><head><title>The Dormouse's story</title></head>
<p class="title"><b>The Dormouse's story</b></p>
<p class="story">Once upon a time there were three little sisters; and their
<a href="http://example.com/elsie" class="sister" id="link1">Elsie</a>,
<a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> and
<a href="http://example.com/tillie" class="sister" id="link3">Tillie</a>;
<p class="story">...</p>
</html>
我不确定为什么给定的例子不起作用。
您正在使用BeautifulSoup版本三 ,而不是版本四。
在BeautifulSoup 3中,该方法称为findAll()
,而不是find_all()
。 因为使用无法识别的属性会被转换为soup.find('unrecognized_attribute')
,所以您要求BeautifulSoup找到第一个<find_all>
HTML元素 ,该元素不存在,因此返回None
。
请改用BeautifulSoup 4:
from bs4 import BeautifulSoup
你几乎可以肯定使用的地方:
from BeautifulSoup import BeautifulSoup # version 3
您需要安装beautifulsoup4
项目。
演示:
>>> html_doc = """
... <html><head><title>The Dormouse's story</title></head>
...
... <p class="title"><b>The Dormouse's story</b></p>
...
... <p class="story">Once upon a time there were three little sisters; and their names were
... <a href="http://example.com/elsie" class="sister" id="link1">Elsie</a>,
... <a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> and
... <a href="http://example.com/tillie" class="sister" id="link3">Tillie</a>;
... <p class="story">...</p>
... """
>>> from bs4 import BeautifulSoup
>>> soup = BeautifulSoup(html_doc)
>>> soup.find_all('b')
[<b>The Dormouse's story</b>]
>>> from BeautifulSoup import BeautifulSoup
>>> soup = BeautifulSoup(html_doc)
>>> soup.find_all('b')
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: 'NoneType' object is not callable
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